二溴对羧基氯磺酚光度法测定地质物料中痕量钪  

Spectrophotometric Determination of Trace Amount of Scandium in Geological Materials with Dibrimo- p-carboxy-sulfochlorophenol

作　　者：董壮龙 魏正妍 韩国防 潘教麦[2] 

机构地区：[1]河南新乡师专化学系 [2]华东师大化学系

出　　处：《岩矿测试》1998年第2期131-133,137,共4页Rock and Mineral Analysis

基　　金：河南省教委自然科学基金

摘　　要：在ｐＨ４的ＨＡｃＮａＡｃ介质中，钪与二溴对羧基氯磺酚发生反应，在５ｍｉｎ内完成显色，生成蓝色配合物，吸光度至少稳定２４ｈ，组成比为１∶３，λｍａｘ＝６３８ｎｍ，ε为３７４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，钪的质量浓度在０～０７２ｍｇ／Ｌ符合比尔定律。试剂对轻稀土有较好的抗干扰能力。所拟方法经国家一级标准物质中钪的测定检验，结果与标准值相符。Scandium reacts with dibrimo- p-carboxy-sulfochlorophenol in pH 4 HAcNaAc buffer solution and forms a 1∶3 blue complex, which is stability for 24 h. The maximum absorbance is at 638 nm with molar absorption of 3.73×104 L·mol-1·cm-1. Beer's law is obeyed in the concentration range of 0～0.72 mg/L for Sc. The system shows better resistance to interferences from light rare earth elements. The proposed method was applied to the determination of Sc in national standard reference materials and the results are in good agreement with recommended values.

关 键 词：二溴 对羧基氢磺酚 分光光度法 地质物料 钪 

分 类 号：O614.321[理学—无机化学] P575.3[理学—化学]